Predicting the size of salt-containing aqueous Na-AOT reverse micellar water-in-oil microemulsions with consideration for specific ion effects

Autor: Hoorshad Fathi-Kelly, Robyn E. Ridley, Olivia A. Graeve, Victor R. Vasquez, James P. Kelly
Rok vydání: 2021
Předmět:
Zdroj: Journal of Colloid and Interface Science. 586:830-835
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2020.11.007
Popis: Hypothesis Reverse micellar solutions are thermodynamically stable systems in which surfactant molecules surround water droplets within a continuous organic phase. Among their many applications, they can be used for the synthesis of nanoparticles of controlled agglomeration. Here, we consider the role specific ion effects play in reverse micelle size reduction. Experiments Dynamic light scattering measurements and the Gouy-Chapman electrical double layer model were combined to study water/AOT/isooctane reverse micellar systems (wo = 10). Linear relationships between the solvodynamic diameter (D) of reverse micelles containing various concentrations of FeSO4, Mg(NO3)2, CuCl2, Al(NO3)3, Fe(NO3)3, Y(NO3)3, NaBH4, ZrOCl2, and NH4OH, and their calculated Debye screening lengths, κ−1, were observed with decreasing D and increasing salt concentration (c). Findings By comparing the linear fits for reverse micelle size as a function of c−1/2, we determined the size can be described as a function of the Debye screening length, cation valency (z), and specific anion hydrated radius (ran), where D = 3.1z κ−1 + bi, and bi is linearly related to ran. Our model accurately predicts reverse micelle sizes with the addition of monovalent, divalent, and trivalent salts for which the primary hydrolyzed cation species has a charge that is equal to the cation valency.
Databáze: OpenAIRE
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